The shooter behind a deadly rampage inside an office building in Midtown Manhattan on Monday evening was apparently targeting NFL offices there, New York City Mayor Eric Adams said Tuesday morning.Law enforcement sources say investigators recovered a three-page rambling note from gunman Shane Tamura's wallet in which he referenced the brain disease CTE.

A fifth shooting victim -- an NFL employee, according to Commissioner Roger Goodell -- was injured and taken to the hospital in critical condition, officials said. That victim was listed in stable condition on Tuesday morning, according to a source familiar with the individual's status.

New York City mayor Eric Adams said Tuesday that the 27-year-old gunman who killed four people and injured another in a shooting at 345 Park Avenue on Monday was trying to target the NFL's headquarters, which are located in that building, but inadvertently took the wrong elevator.